In the formation of recombinant DNA, what enzyme is needed to seal the sticky ends of genes into plasmids or chromosomes?
A. Primase
B. DNA ligase
C. DNA helicase
D. DNA polymerase I
E. DNA polymerase II
Answer: B
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With the sequence of the gene-coding regions of the human genome in hand and the development of newer sequencing methods, scientists ____
a. now know that the types of mutations present in all cancers are very similar b. can now sequence and analyze the protein-coding genes in cancer cells c. are still unable to systematically identify all the mutations present in a cancer cell d. found that the number of mutational events that occur during the transition from normal to malignant cells is much smaller than previously thought e. found that most tumors had at least 100 mutations in common with any other tumor, emphasizing the common origin of cancer
In terrestrial animals, such as the bird, the embryo is exposed to a dry environment while in the egg
Indicate whether the statement is true or false.
Splicing of mRNA removes which of the following?
a. promoter b. nucleotide cap c. introns d. transcript e. exons
A biology classmate seems confused by something he read at the professor's website about calcium imbalances and neurotoxins interfering with proper functioning of the muscular system–even to the point of causing death by suffocation. He states the
professor probably goofed up and meant the skeletal, nervous, and respiratory systems were adversely affected. Defend your professor's statements. What will be an ideal response?